6.6-stable review patch. If anyone has any objections, please let me know.
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From: Hagar Hemdan hagarhem@amazon.com
commit b97e8a2f7130a4b30d1502003095833d16c028b3 upstream.
its_vlpi_prop_update() calls lpi_write_config() which obtains the mapping information for a VLPI without lock held. So it could race with its_vlpi_unmap().
Since all calls from its_irq_set_vcpu_affinity() require the same lock to be held, hoist the locking there instead of sprinkling the locking all over the place.
This bug was discovered using Coverity Static Analysis Security Testing (SAST) by Synopsys, Inc.
[ tglx: Use guard() instead of goto ]
Fixes: 015ec0386ab6 ("irqchip/gic-v3-its: Add VLPI configuration handling") Suggested-by: Marc Zyngier maz@kernel.org Signed-off-by: Hagar Hemdan hagarhem@amazon.com Signed-off-by: Thomas Gleixner tglx@linutronix.de Cc: stable@vger.kernel.org Reviewed-by: Marc Zyngier maz@kernel.org Link: https://lore.kernel.org/r/20240531162144.28650-1-hagarhem@amazon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/irqchip/irq-gic-v3-its.c | 44 ++++++++++----------------------------- 1 file changed, 12 insertions(+), 32 deletions(-)
--- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -1840,28 +1840,22 @@ static int its_vlpi_map(struct irq_data { struct its_device *its_dev = irq_data_get_irq_chip_data(d); u32 event = its_get_event_id(d); - int ret = 0;
if (!info->map) return -EINVAL;
- raw_spin_lock(&its_dev->event_map.vlpi_lock); - if (!its_dev->event_map.vm) { struct its_vlpi_map *maps;
maps = kcalloc(its_dev->event_map.nr_lpis, sizeof(*maps), GFP_ATOMIC); - if (!maps) { - ret = -ENOMEM; - goto out; - } + if (!maps) + return -ENOMEM;
its_dev->event_map.vm = info->map->vm; its_dev->event_map.vlpi_maps = maps; } else if (its_dev->event_map.vm != info->map->vm) { - ret = -EINVAL; - goto out; + return -EINVAL; }
/* Get our private copy of the mapping information */ @@ -1893,46 +1887,32 @@ static int its_vlpi_map(struct irq_data its_dev->event_map.nr_vlpis++; }
-out: - raw_spin_unlock(&its_dev->event_map.vlpi_lock); - return ret; + return 0; }
static int its_vlpi_get(struct irq_data *d, struct its_cmd_info *info) { struct its_device *its_dev = irq_data_get_irq_chip_data(d); struct its_vlpi_map *map; - int ret = 0; - - raw_spin_lock(&its_dev->event_map.vlpi_lock);
map = get_vlpi_map(d);
- if (!its_dev->event_map.vm || !map) { - ret = -EINVAL; - goto out; - } + if (!its_dev->event_map.vm || !map) + return -EINVAL;
/* Copy our mapping information to the incoming request */ *info->map = *map;
-out: - raw_spin_unlock(&its_dev->event_map.vlpi_lock); - return ret; + return 0; }
static int its_vlpi_unmap(struct irq_data *d) { struct its_device *its_dev = irq_data_get_irq_chip_data(d); u32 event = its_get_event_id(d); - int ret = 0;
- raw_spin_lock(&its_dev->event_map.vlpi_lock); - - if (!its_dev->event_map.vm || !irqd_is_forwarded_to_vcpu(d)) { - ret = -EINVAL; - goto out; - } + if (!its_dev->event_map.vm || !irqd_is_forwarded_to_vcpu(d)) + return -EINVAL;
/* Drop the virtual mapping */ its_send_discard(its_dev, event); @@ -1956,9 +1936,7 @@ static int its_vlpi_unmap(struct irq_dat kfree(its_dev->event_map.vlpi_maps); }
-out: - raw_spin_unlock(&its_dev->event_map.vlpi_lock); - return ret; + return 0; }
static int its_vlpi_prop_update(struct irq_data *d, struct its_cmd_info *info) @@ -1986,6 +1964,8 @@ static int its_irq_set_vcpu_affinity(str if (!is_v4(its_dev->its)) return -EINVAL;
+ guard(raw_spinlock_irq)(&its_dev->event_map.vlpi_lock); + /* Unmap request? */ if (!info) return its_vlpi_unmap(d);